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MCB size for dedicated fused spurs

Johno12345
A little thought, when installing a new circuit for a fused spur to supply an alarm or something similar, just about everyone uses a standard 2.5mm radial circuit, but the MCB size seems to vary from 16a down to 6. 


part of me (the larger part) thinks, just keep it standard 16a, and another part says to size the breaker to the load 


(I'm a specifier, not installer)
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  • 0
    OlympusMons:

    An oven and cooker hood usually have a luminaire, which can be used solely for the purpose of providing light. The oven can also cook, the hood also extracts. When used for lighting purposes, the circuits can have min CSA 0.5mm2. They would also need RCD protection.

    Apologies to OP for a bit of thread drift. 


    If you were being pedantic, you'd ask whether the appliance were made to a product standard for luminaires, or a product standard for an extractor: it's likely to be the latter ...


    Where do we stand with lighting fed from an FCU on a socket-outlet circuit? Is that a "new circuit" (potentially, it has a common protective device being the fuse ...)?


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  • 0
    OlympusMons:

    An oven and cooker hood usually have a luminaire, which can be used solely for the purpose of providing light. The oven can also cook, the hood also extracts. When used for lighting purposes, the circuits can have min CSA 0.5mm2. They would also need RCD protection.

    Apologies to OP for a bit of thread drift. 


    If you were being pedantic, you'd ask whether the appliance were made to a product standard for luminaires, or a product standard for an extractor: it's likely to be the latter ...


    Where do we stand with lighting fed from an FCU on a socket-outlet circuit? Is that a "new circuit" (potentially, it has a common protective device being the fuse ...)?


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